Christopher A Sharp

US Patent:

6615580, Sep 9, 2003

Filed:

Sep 24, 2001

Appl. No.:

09/961442

Inventors:

Magdi K. Khair - San Antonio TX
Cynthia C. Webb - San Antonio TX
Gordon J. Bartley - San Antonio TX
Christopher A. Sharp - San Antonio TX

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

F01N 300

US Classification:

60286, 60274, 60285, 60288, 60311

Abstract:

A method for controlling diesel engine emissions is disclosed. The diesel engines exhaust system has a diesel particulate filter (DPF) and a lean NO trap (LNT). The DPF is a filter and is monitored to determine the need for regeneration. The LNT is monitored to determine the need for regeneration or desulfurization. A fuel injector is used to inject fuel upstream of the LNT under certain conditions, and a bypass may be used to bypass exhaust around the DPF to provide richer or hotter exhaust to the LNT. The sensor outputs and controls for providing the appropriate heat or fuel mix for regeneration and desulfurization may be controlled with enhancements to existing engine control circuitry.

US Patent:

6718757, Apr 13, 2004

Filed:

Jan 21, 2003

Appl. No.:

10/347722

Inventors:

Magdi K. Khair - San Antonio TX
Cynthia C. Webb - San Antonio TX
Gordon J. Bartley - San Antonio TX
Christopher A. Sharp - San Antonio TX

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

F01N 300

US Classification:

60286, 60274, 60276, 60285, 60288, 60295, 60297

Abstract:

A method for controlling diesel engine emissions is disclosed. The diesel engines exhaust system has a NO oxidation catalyst, a diesel particulate filter (DPF), and a lean NO trap (LNT). The DPF is monitored to determine the need for regeneration. The LNT is monitored to determine the need for regeneration or desulfurization. A fuel injector is used to inject fuel upstream of the LNT under certain conditions, and a bypass may be used to bypass exhaust around the oxidation catalyst to provide richer or hotter exhaust to the LNT.

US Patent:

7135153, Nov 14, 2006

Filed:

Mar 7, 2002

Appl. No.:

10/093199

Inventors:

Gordon James Johnston Bartley - San Antonio TX, US
Christopher Alan Sharp - San Antonio TX, US

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

B01D 53/34

US Classification:

422168

Abstract:

An emission control system for reducing NOin the exhaust of a diesel engine. A partial oxidation system receives diesel fuel from the engine's fuel tank and partially oxidizes the diesel fuel into hydrogen. The hydrogen is then introduced into the main exhaust line and the hydrogen-enhanced exhaust is delivered to a hydrogen selective catalytic reduction unit, which uses the hydrogen to convert the NOto nitrogen.

US Patent:

7163668, Jan 16, 2007

Filed:

Feb 27, 2004

Appl. No.:

10/788508

Inventors:

Gordon James Johnston Bartley - San Antonio TX, US
Christopher Alan Sharp - San Antonio TX, US

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

B01D 53/56

US Classification:

4232391

Abstract:

An emission control system for reducing NOin the exhaust of a diesel engine. A partial oxidation system receives diesel fuel from the engine's fuel tank and partially oxidizes the diesel fuel into hydrogen. The hydrogen is then introduced into the main exhaust line and the hydrogen-enhanced exhaust is delivered to a hydrogen selective catalytic reduction unit, which uses the hydrogen to convert the NOto nitrogen.

US Patent:

7195006, Mar 27, 2007

Filed:

Nov 29, 2005

Appl. No.:

11/288891

Inventors:

Magdi K. Khair - San Antonio TX, US
Yiqun Huang - San Antonio TX, US
Christopher A. Sharp - San Antonio TX, US
Cynthia C. Webb - San Antonio TX, US

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

F02M 25/07
F02B 47/08
F02B 33/44
F28F 27/02

US Classification:

12356812, 606052

Abstract:

A method and system for controlling the temperature of recirculated exhaust gas in an exhaust gas recirculation (EGR) system, such as those used in connection with diesel engines. An EGR loop (which may be either a high pressure loop or a low pressure loop) has a dual-leg segment with an EGR cooler on one leg and an EGR heater on the other leg. By means of a valve, the EGR gas may be diverted to either one leg or the other, thereby providing either cooled or heated EGR gas to the engine.

US Patent:

7357900, Apr 15, 2008

Filed:

Sep 6, 2006

Appl. No.:

11/470413

Inventors:

Gordon James Johnston Bartley - San Anonio TX, US
Christopher Alan Sharp - San Antonio TX, US

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

B01D 50/00

US Classification:

422168

Abstract:

An emission control system for reducing NOin the exhaust of a diesel engine. A partial oxidation system receives diesel fuel from the engine's fuel tank and partially oxidizes the diesel fuel into hydrogen. The hydrogen is then introduced into the main exhaust line and the hydrogen-enhanced exhaust is delivered to a hydrogen selective catalytic reduction unit, which uses the hydrogen to convert the NOto nitrogen.

US Patent:

7550126, Jun 23, 2009

Filed:

Jan 25, 2007

Appl. No.:

11/627122

Inventors:

Cynthia C. Webb - San Antonio TX, US
Christopher A. Sharp - San Antonio TX, US

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

C01B 21/20
G05D 7/00

US Classification:

423385, 423400, 423402, 423403, 423405, 422105, 422107, 73 2331, 7311401, 7311802

Abstract:

Various methods and systems for augmenting the amount of NOin the exhaust of an exhaust flow simulation system. These methods and system can be “combustion” or “post combustion”. A combustion embodiment injects a nitrogen-containing compound (doping agent) into the burner, so that it mixed and combusted with the fuel.

US Patent:

8001769, Aug 23, 2011

Filed:

Aug 20, 2007

Appl. No.:

11/892132

Inventors:

Zhiyong Wei - Chicago IL, US
Theodore M. Kostek - San Antonio TX, US
Christopher Alan Sharp - San Antonio TX, US

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F01N 3/00

US Classification:

60286, 60274, 60284, 60295, 60301, 60285

Abstract:

An emissions control system is disclosed. The emissions control system may have a power source that creates a flow of exhaust and a filtering device that receives the flow of exhaust. A first sensor may be located at or upstream of the filtering device, the first sensor being configured to measure a first temperature, and an SCR catalyst may be located downstream of the filtering device. The emissions control system may also have an injector configured to inject a reduction agent into the flow of exhaust in the presence of the SCR catalyst. The emissions control system may further have a controller in communication with the first sensor. The controller may be configured to predict a change in an ability of the SCR catalyst to store reduction agent using a measured change in the first temperature and adjust the injector according to the predicted change in the storage ability of the SCR catalyst.